View Compilation Error

1_867_2585_24355.cpp:6:1: error: 'map' does not name a type
 map<string,int> mp;
 ^
1_867_2585_24355.cpp: In function 'int main()':
1_867_2585_24355.cpp:53:5: error: 'mp' was not declared in this scope
     mp["Beijing"]=8;
     ^